检索结果-内蒙古大学图书馆

Southeastern Symposium on System Theory

作者： A.K. Ojha D.B. Koch Communications Information and Signal Processing Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

Power-limited radar systems generally employ some form of pulse compression or waveform coding to improve range resolution. Frank polyphase coded waveforms have been used in the past for pulse compression in high resolution radars. This paper evaluates the impact of Swerling I and Swerling II target scintillation models in the presence of additive white Gaussian noise (AWGN) on the resolution properties of Frank coded waveforms. The results presented in this paper bear out the interesting fact that the use of an appropriate model is highly desirable to avoid misleading results.

关键词： Fluctuations Autocorrelation Pulse compression methods Space vector pulse width modulation Radar signal processing signal processing signal resolution Additive white noise Radar detection Matched filters

来源：评论

学校读者我要写书评

暂无评论

Impact of noise and target fluctuation on the performance of binary phase coded radar signals

Impact of noise and target fluctuation on the performance of...

引用

IEEE Southeastcon

作者： A.K. Ojha D.B. Koch Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

The authors evaluate the impact of Swerling I and Swerling II target scintillation models in the presence of additive white Gaussian noise on the resolution properties of pseudonoise (PN) sequence coded waveforms. There are two major factors which significantly affect the performance of radar systems. The first well-known factor is noise, ambient or intentional. The second factor is due to the variation in the echo signal with time: this is also called target fluctuation or scintillation. The effect due to each of these factors has been incorporated into the performance evaluation procedure by applying appropriate statistical models to the problem. The results presented bear out the fact that the use of an appropriate model is highly desirable to avoid misleading results.< >

关键词： Phase noise Fluctuations Pulse compression methods Space vector pulse width modulation Autocorrelation Additive white noise Radar signal processing signal processing Gaussian noise signal resolution

来源：评论

学校读者我要写书评

暂无评论

Effects of processing errors in the quadrature sampling of complementary coded radar signals

Effects of processing errors in the quadrature sampling of c...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： A.K. Ojha D.B. Koch Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

Phase coding and linear frequency modulation in analog or discrete form are widely used in power-limited radar systems for pulse compression to achieve high range resolution. Such coded waveforms are detected by appropriately matched filtering of the in-phase and the quadrature samples derived from the received signal. Complementary codes have generated such interest in the area of high-resolution radar signal design. There are, however, no published results to judge the robustness of this coding scheme in the presence of quadrature channel imbalance. Monte Carlo simulation results are presented to fill this gap. It is concluded from the results that although the degradation in the case of complementary codes increases more rapidly than for Frank codes, complementary-coded waveforms have better overall performance than Frank-coded waveforms in the presence of sampling errors.< >

关键词： Sampling methods signal sampling Chirp modulation Pulse compression methods signal resolution Radar detection Matched filters Filtering signal generators signal design

来源：评论

学校读者我要写书评

暂无评论

DEGREES OF CYCLOSTATIONARITY AND THEIR APPLICATION TO signal-DETECTION AND ESTIMATION

引用

signal processing 1991年第3期22卷 287-297页

作者： ZIVANOVIC, GD GARDNER, WA Computer Systems Design Laboratory “Boris Kidrič” Institute Vinča P.O. Box 522 11001 Belgrade Yugoslavia Signal Processing Group Department of Electrical Engineering & Computer Science University of California Davis CA 95616 USA

The problem of defining an appropriate measure of the degree of nonstationarity for stochastic processes that exhibit cyclostationarity is addressed. After discussing several candidate measures of degree of nonstationarity, one particularly promising measure is adopted. By decomposing this measure, several component measures are arrived at. Bounds on these measures are derived and their utility in applications involving signal detection and estimation is established. Examples are presented to illustrate the calculation of degrees of nonstationarity for several types of cyclostationary signals.

关键词： CYCLOSTATIONARY PROCESS DEGREE OF CYCLOSTATIONARITY INSTANTANEOUS SPECTRUM SPECTRAL CORRELATION

来源：评论

学校读者我要写书评

暂无评论

A VLSI DSP chip for real time iterative deconvolution

A VLSI DSP chip for real time iterative deconvolution

引用

IEEE Southeastcon

作者： R.B. Whitted P.B. Crilly Department of Electrical and Computer Engineering Communications Information and Signal Processing Group Knoxville TN USA

The design of a CMOS VLSI chip to perform real-time iterative deconvolution is presented. A bit-level systolic array architecture for convolution, multiplication, and addition is used to implement the circuit. A brief introduction to the iterative deconvolution problem is also given. Simulations done to data have shown that the systolic array portions of the chip will yield satisfactory throughput for millions of iterations per second.< >

关键词： Very large scale integration Digital signal processing chips Deconvolution Systolic arrays Convolution Spectroscopy Fourier transforms Circuits Semiconductor device measurement Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Performance analysis of complementary coded radar signals in an AWGN environment

Performance analysis of complementary coded radar signals in...

引用

IEEE Southeastcon

作者： A.K. Ojha D.B. Koch Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

The authors investigate the performance of PN (pseudonoise) codes and complementary codes in an additive white Gaussian noise (AWGN) environment from a detection standpoint, and they provide a comparison of the performance of these two coding methods in a pulsed radar context. A general method of choosing a cost function is proposed to compare the two coding schemes. Simulation results are presented which demonstrate that, for the AWGN channel model used, the complementary coded signals can provide improved performance over PN coded signals in practical pulsed radar systems.< >

关键词： Performance analysis AWGN Autocorrelation signal resolution Space vector pulse width modulation Radar signal processing Radar detection Pulse compression methods Spread spectrum radar Additive white noise

来源：评论

学校读者我要写书评

暂无评论

Frame synchronization using complementary codes in digital communication systems

Frame synchronization using complementary codes in digital c...

引用

IEEE Southeastcon

作者： T.D. Robinson D.B. Koch Communications Information and Signal Processing (CISP) Group Department of Electrical & Computer Engineering University of Tennessee Knoxville TN USA

Expressions are developed which can be used to determine the false-detection performance of complementary codes. The false-detection performance of complementary phase codes for various bit-error rates is presented and verified through simulation. It is shown that all complementary phase code pairs of the same length perform equally when preceded by random data. This shows that the performance of a two-sequence codeword depends only on the combined autocorrelation properties of the two sequences. When preceded by recovery data, all complementary phase code pairs are not found to perform equally; however, one pair (01001000, 10111000) is found to be nearly optimum for all five bit-error probabilities.< >

关键词： Digital communication Time division multiple access Phase change materials Satellite communication Radar detection Phase detection Pulse modulation Transmitters Binary sequences Quadrature phase shift keying

来源：评论

学校读者我要写书评

暂无评论

A digital signal processing chip for iterative deconvolution restoration algorithms

A digital signal processing chip for iterative deconvolution...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： R.B. Whitted P.B. Crilly Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

A VLSI DSP chip is presented that will significantly improve the processing throughput for a general class of iterative deconvolution algorithms. The design will be based on a systolic array concept. This will enable these algorithms to be used for real time DSP applications which formerly due to speed limitations were not possible. The increased class of applications will enable further understanding of these applications. The higher throughput will also enable the researcher to further take advantage of the features unique to iterative deconvolution.< >

关键词： Digital signal processing chips Deconvolution signal restoration signal processing algorithms Iterative algorithms Wiener filter Throughput Spectroscopy Additive noise Distortion

来源：评论

学校读者我要写书评

暂无评论

FULL-WAVE SOLUTION OF DIELECTRIC LOADED WAVE-GUIDES AND SHIELDED MICROSTRIPS UTILIZING FINITE-DIFFERENCE AND THE CONJUGATE-GRADIENT METHOD

引用

INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-AIDED engineering 1991年第4期1卷 346-357页

作者： NARAYANAN, V MANELA, M LADE, RK SARKAR, TK Department of Electrical and Computer Engineering Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade. Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was

Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue problem. Since the matrix is also sparse, the eigenvalue problem can be solved quickly and efficiently using the conjugate gradient method resulting in considerable savings in computer storage and time. Comparison is made with the analytical solution for the loaded dielectric waveguide case. For the microstrip case, we get both waveguide modes and quasi-TEM modes. The quasi-TEM modes in the limit of zero frequency are checked with the static analysis which also uses finite difference. Some of the quasi-TEM modes are spurious. This article describes their origin and discusses how to eliminate them. Numerical results are presented to illustrate the principles.

关键词： Waveguides

来源：评论

学校读者我要写书评

暂无评论

Multi-layered neural networks and Volterra series: The missing link

Multi-layered neural networks and Volterra series: The missi...

引用

IEEE International Conference on Systems engineering

作者： G. Govind P.A. Ramamoorthy M. L. 30 Signal Processing and Computer Vision Group Department of Electrical and Computer Engineering University of Cincinnati Cincinnati OH USA

The similarities and differences between the conventional Volterra series techniques and the neural network approach are discussed. The analysis is done from the point of view of representation capabilities for nonlinear systems, and it is shown that a small neural network can represent high-order nonlinear systems, whereas a very large number of terms are required for an equivalent Volterra series representation. This is shown by means of a series expansion of a neural network. Issues common to the two nonlinear modeling approaches are analyzed

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：